The transfer of genetic material from one bacterium to another through the mediation of a vector like virus is termed as :

Options

A. transduction
B. conjugation
C. transformation
D. translation

Answer

To solve the question regarding the transfer of genetic material from one bacterium to another through a vector like a virus, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking about a specific process where genetic material is transferred between bacteria with the help of a vector, which in this case is a virus.

2. **Identify the Key Terms**:
- **Genetic Material Transfer**: This refers to the movement of DNA or genes from one organism to another.
- **Vector**: In this context, a vector is a carrier that facilitates the transfer of genetic material. Here, the vector is a virus.

3. **Review the Options**:
- **Transduction**: This is the process where a bacteriophage (a type of virus that infects bacteria) transfers genetic material from one bacterium to another.
- **Conjugation**: This is a direct transfer of DNA between two bacteria through a physical connection (pilus).
- **Transformation**: This involves the uptake of free DNA from the environment by a bacterium.
- **Translation**: This is the process of synthesizing proteins from mRNA and is not related to the transfer of genetic material between bacteria.

4. **Determine the Correct Answer**:
- Since the question specifically mentions the mediation of a vector like a virus, the correct answer is **Transduction**. In transduction, a bacteriophage acts as the vector to transfer genetic material from a donor bacterium to a recipient bacterium.

5. **Conclusion**: The transfer of genetic material from one bacterium to another through the mediation of a vector like a virus is termed as **Transduction**.

### Final Answer:
**Transduction**